get_aliases.js

const _ = require( 'lodash' )

let aliases = [
  "alias",
  [
    "  aliases    ",
    [
      "idk",
      "TEST ",
      123
    ],
    {
      "a": 12
    }
  ],
  false,
  null,
  null,
  true,
  [
    "IDK",
    function(){},
    zomg => false
  ]
]

const _aliases = _.chain( aliases )
  .thru( val => {
    if ( _.isArray( val ) ) 
      return val

    if ( _.isString( val ) ) 
      return [ val ]

    return 
  })
  .flattenDeep()
  .map( val => _.isString( val ) ? val : null )
  .map( _.trim )
  .map( _.toLower )
  .compact()
  .sortedUniq()
  .value()

// Result: ["alias", "aliases", "idk", "test", "idk"]